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dude just buy a soldering iron and solder it back on it's not hard soldering irons are cheap and everyone messing around with quantum boards should have one anyway. looks like it was a dry joint. watch a youtube video on how to solder.

I have two ph pens the same, just cheap ones. also have a roll of expensive narrow range ph paper and lots of ph6 and ph4 buffering solution sachets. calibrate frequently and always test with both ph pens to make sure one's not out of whack. test with a bit of the ph paper if there's any doubt...

Did you LST that stem down or did it do it by it's self? I just ordered this strain, so trying to figure out what to expect. From what I've heard it kinds ties it's self in knots.

Gosh darn it I wish I had stumbled on this thread a week ago. I just ordered a bunch of candy dawg seeds and am awaiting delivery. Still I'm glad I saw the thread before starting. So for you folks who have finished, how many days overall from germination to harvest? and how many would you...

Hi all, I have previously had seeds shipped by stealth shipping from Alibongo seeds in the UK, but it seems I can't use them anymore, I don't know why but payments to them keep failing. does anyone know a seed bank that will sell and ship to Australia? One with a very good stealth shipping...

funny thing, this morning one of my home built drivers blew up and i'm now running at half power with no CC function. I ordered an HLG-600-48A this afternoon to replace it and I got free shipping on it from Mouser - and it was cheaper than Digikey. Cost me $290 in the local currency, so about...

Not to the opposite end of the universe where I live. I ordered $2K worth of QB22a strips from them and still had to pay shipping. It's the import duties that are the killer though, 15% of the gross plus customs fees plus brokerage fees. plus the fact that they open up all your packages for a...

Oh yes, I stand corrected. those were the same charts I looked at when I was considering meanwell and I see now they are pretty darned good upwards of 50% load as you said, at least on the 600W 48V ones I need. Sadly Inventronics aren't sold here. Best I can do is use the local digikey site and...

good idea, if you're using 5000K qb22a strips and driving them under binning current you ought to make 220lm/w easily. I think that aluminium flat bar you have will sag without something to hold it rigid. I'm not sure so don't quote me on this but I looked over the spec sheet for the lm301b...

I use the 4000K ones, so there's not really any need to add any red or blue. That's just my opinion though based on the look of the spectral chart samsung published for the lm301b. I don't have a ppfd meter to do my own analysis. The reason I suggested running them at binning current like you're...

I use those strips. they are excellent. I use 15 strips per lighting rig, each one glued with thermal adhesive to a length of 1" square aluminium extrusion. I run the whole thing at 11 amps, so 730mA per strip. they stay cool to the touch at that current level but get a lot warmer if I go up to...

buy this...

probably a bit late to the party on this one, and folks are gonna hate on me for this, but if you want to stop your plants getting taller and you can't find another way just foliar spray them once with paclobutrazol when you want them to stop getting taller. they will stop growing vertically the...

It looks like cannabis will be decriminalized in my country next year (still technically illegal to possess and highly illegal to grow without a licence, but no prosecutions for possession) . It's already been decriminalized for the terminally ill and CBD has been legalized. There is a public...

I know how counter intuitive it sounds, but samsung strips with the LM561c and LM302b chips don't need a lot of thermal management. you look at them out of the box and think they're going to catch fire because they are just on a PCB, but the damn things are so efficient you don't need much of a...

Yeah it's weird man, according to the samsung data sheet for the QB22a they only use lm301b diodes, but that binning code doesn't seem to appear anywhere in the lm301b data sheet. wtf.

Yep, turns out I was dreaming about that 96% figure. Good news is, the lab power supply display is pretty accurate. Bad news is the el-cheapo plug in type power meter is a bust if there's a reactive load or anything that generates harmonics on it. works fine when you plug the kettle into it. I...

Hey thanks for your comment, I was wondering if someone who knows DC to DC converters was going to call me out on the efficiency. It seemed unlikely to me also, and the thing is the AC measurement was just taken from an inexpensive plug in power monitor which is dubious in it's self. To add to...

Hey there folks, couple pics attached of my QB22a build. It's 15 strips all in parallel. Running my own home brew drivers I've built 4 of these, and just wondering how the driver efficiency compares to that of meanwell drivers which everyone seems to be using. So I'm running my strips at 11.05A...

I'm still using a filter I bought seven years ago, I've refreshed it once. can't remember the name of it as it's got no stickers or anything on it but generally speaking just buy the heaviest one you can find. when it starts letting odor through pull it apart, put all the carbon pellets in the...